Examination method and apparatus

G - Physics – 01 – N

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G01N 23/04 (2006.01)

Patent

CA 2546592

A method for examination of a subject comprises the steps of: administering (32) a contrast-enhancing agent into a subject (7, 42) to be examined, the contrast-enhancing agent introducing density variations in the subject; directing (33) ionizing radiation (3) towards the subject; and detecting (34) ionizing radiation spatially resolved as transmitted through the subject, while Compton scattered radiation (3a, 3c) in the subject is essentially prevented from being detected. The ionizing radiation directed towards the subject is provided within a spectral range so that more photons of the ionizing radiation are Compton scattered than absorbed through the photoelectric effect in the subject to thereby detect the density variations introduced by the contrast-enhancing agent in the subject spatially resolved.

L'invention concerne un procédé d'examen d'un sujet comprenant les étapes suivantes : administration (32) d'un agent d'accentuation de contraste dans un sujet à examiner (7, 42), l'agent d'accentuation de contraste introduisant des variations de densité chez le sujet ; émission (33) d'un rayonnement ionisant (3) en direction du sujet ; et détection (34) du rayonnement ionisant résolu spatialement et transmis à travers le sujet, en empêchant le rayonnement Compton diffusé (3a, 3c) d'être détecté dans le sujet. Le rayonnement ionisant dirigé vers le sujet est prévu dans une gamme spectrale, de telle façon que davantage de photons du rayonnement ionisant soient diffusés par effet Compton, plutôt qu'absorbés par effet photoélectrique dans le sujet, ce qui permet de détecter les variations de densité introduites par l'agent d'accentuation de contraste dans le sujet résolu spatialement.

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